/* ==========================================
   header + 背景（prefix: headermenu_）
   ========================================== */

/* ===== 背景 ===== */
.headermenu_bg_container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

    z-index: 0;
}

/* 背景画像 */
.headermenu_bg_image {
    width: 100%;
    height: 100%;

    background-image: url('/img/bg.png');
    background-size: cover;
    background-position: center;

    filter: blur(4px);
    transform: scale(1.05);
}

/* 暗幕 */
.headermenu_bg_overlay {
    position: absolute;
    width: 100%;
    height: 100%;

    background: rgba(0, 10, 30, 0.35);
}

/* ===== ヘッダー ===== */
.headermenu_container {
    position: relative;
    z-index: 100;

    display: flex;
    justify-content: space-between;
    align-items: center;

    padding: 20px 40px;

    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
}

/* ロゴ */
.headermenu_logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 20px;
    color: #ffffff;
}

/* ナビ */
.headermenu_nav {
    display: flex;
    gap: 20px;
}

.headermenu_link {
    color: #ffffff;
    text-decoration: none;
    transition: 0.3s;
}

.headermenu_link:hover {
    color: #00ffff;
    text-shadow: 0 0 8px #00ffff;
}